Question

1. Consider following truss 24 kN 4.5 m 3.2 m 6 m 6 m Replace pins at A and B with forces and redraw the truss. Pin at joint B is replaced with Fax and FBY. Pin at joint A can be replaced with a singe force along the line of action of member AC. Why do we know direction of force exerted by pin at A onto the member AC a. b. Calculate extemal forces by setting sum of the moments about point of your choice and sums of the forces in each direction equal to zero.

Answer 1

4.5m 24 KN 3-2 6MA 4 S Ac. 4.9 24 KN Fen 3-2 m By osthout dmectuos of Foree he eactyor at tomte mamend eauatyos Eonce talamce eauatuon RAc easidy decto calculate So Cant balasce (Rec)x t Fosce - Fr balaoce 4-dasect4on Force + 24 ahout balance Pount MomentT X 4.C t 24X12 o 64-KN 64 KN Rec) 64 4.S RAc aA BAK -06.67 KN -a rs 480R 106:67x 6 3 s.336 kN

the in eauaton Put value Fey Rac t24 8S.336 +24 FR 61. 33 KN FR Reactio force at B L64)2 +(61 336) 88.64S KN